Question

Calculează:
a)1:1
b)3-1
c)2-1
d)x² - x +2x +2=0​

Answer 1

Răspuns:

x² - x + 2x + 2 = 0​

x² + (2x - x) + 2 = 0

x² + x + 2 = 0

Δ = √b² - 4ac = √1² - 4×1×2 = √1 - 8 = √-7

Δ < 0 => x ∉ R

Ecuatia nu are solutii in multimea numerelor reale (R)